9 results about "Salinity stress" patented technology

The invention provides a rapid evaluation method and system for the soil fertility level, and relates to the technical field of soil fertility detection.The rapid evaluation method comprises the steps that an original absorbance spectral data curve is obtained by scanning a soil sample, the moisture peak absorbance, the actual peak position wavelength and the moisture synthetic frequency characteristic peak width are extracted, and a spectral data basis is provided; a water-salt optical path coupling factor is calculated, water-salt correction operation is carried out in combination with a volume correction coefficient, a virtual dry soil spectrum data curve is obtained, interference of salt on a water optical path is quantified, and a water background and salt masking are eliminated; constructing a characteristic virtual baseline of the organic matter and the total nitrogen, calculating an integral area to obtain characteristic intensity of the organic matter and the total nitrogen, and providing a physical input variable for quantitative inversion; introducing a water-salt optical path coupling factor to invert the organic matter content and the total nitrogen content, and correcting signal depression caused by salt stress; the effective fertility index is calculated and graded by combining the organic matter content and the total nitrogen content of the soil, and the actual fertilizer supply capacity of the soil is comprehensively evaluated.

The invention relates to the technical field of agricultural engineering, in particular to a water and fertilizer regulation and control method and system for saline-alkali soil grain-fed crops, and the method comprises the following steps: S1, synchronously obtaining soil salinity concentration, soil moisture content and available nitrogen concentration; s2, calculating a salinity stress index, and dividing stress levels; s3, if the soil moisture content is lower than the preset crop suitable lower limit, the irrigation compensation amount is increased; if the soil moisture content is normal, the pulse irrigation mode is adjusted according to the stress level; s4, the nitrogen fertilizer notch amount is calculated according to comparison between the available nitrogen concentration in the S1 and the nitrogen demand threshold value in the crop growth stage; and S5, dynamically adjusting the fertilizer injection concentration and the irrigation duration in the water and fertilizer integrated application. By monitoring soil parameters in real time and dynamically adjusting water and fertilizer supply, accurate regulation and control of water and fertilizer of saline-alkali soil crops are achieved, the utilization efficiency of the fertilizer is improved, the growth environment of the crops is optimized, and resource waste and environmental pollution are reduced.

The application provides a soil fertility level rapid evaluation method and system, relates to the soil fertility detection technical field, and provides the spectrum data basis through scanning soil samples to obtain the original absorbance spectrum data curve and extracts the water peak value absorbance, the actual peak wavelength and the water combined frequency characteristic peak width; calculates the water salt optical path coupling factor and carries out water salt correction operation to obtain the virtual dry soil spectrum data curve in combination with the volume correction coefficient, quantifies the interference of the salt on the water optical path and eliminates the water background and the salt masking; the characteristic virtual baseline of organic matter and total nitrogen is constructed, and the integral area is calculated to obtain the characteristic intensity of organic matter and total nitrogen, so that physical input variables are provided for quantitative inversion; the water salt optical path coupling factor is introduced to invert the organic matter content and the total nitrogen content, the signal suppression caused by the salt stress is corrected; the effective fertility index is calculated in combination with the organic matter content and the soil total nitrogen content, and is classified, so that the comprehensive evaluation of the actual fertilization capacity of the soil is realized.

This invention discloses a device and method for simulating the effects of salinity stress during freeze-thaw cycles on the rhizome germination of emergent plants, belonging to the field of emergent plant germination experiments in cold and arid regions. The device includes an outdoor main pool and a laboratory auxiliary pool, connected by a closed channel with double gates. The bottom of the main and auxiliary pools is equipped with sliding tracks and transfer channels. Within the transfer channels, a translation screw, in conjunction with an electromagnet, drives the base frame to move without breaking ice. The main pool is equipped with freeze-thaw, salinity, and nutrient regulation modules. The method uses an L18 (3²×6¹) orthogonal array to design experimental combinations of freeze-thaw patterns, salinity, and nutrients. The base frame is transferred to the auxiliary pool without breaking ice, and stratified morphological and physiological indicators are measured simultaneously. Data are harvested at the end of the experiment, and variance analysis is performed. This invention achieves undisturbed monitoring of the experimental environment, accurately recreates the complex stress environment, quantifies the effects of the three factors, provides a scientific basis for the ecological restoration of saline-alkali wetlands, and is convenient to operate and highly repeatable.

The invention discloses a device and a method for simulating influence of salinity stress in freezing and thawing periods on germination of rhizomes of emergent aquatic plants, and belongs to the field of germination experiments of emergent aquatic plants in cold and arid regions. The device comprises an outdoor main pool and a research laboratory auxiliary pool which are communicated through a closed channel with double gates, the bottoms of the main pool and the auxiliary pool are provided with sliding ways and moving ways, and translation lead screws in the moving ways are matched with electromagnets to drive a base frame to move without icebreaking; and the main pond is matched with a freeze thawing, salinity and nutritive salt regulation and control module. According to the method, an L18 (3 * 6) orthogonal table is adopted to design a freeze-thaw mode, salinity and nutritive salt three-factor experimental combination, a base frame is transferred to an auxiliary pool without icebreaking, layering morphology and physiological indexes are measured synchronously, harvesting is conducted at the last stage of an experiment, and data variance analysis is conducted. According to the invention, undisturbed monitoring of the experimental environment is realized, the composite stress environment is accurately restored, the three-factor effect is quantified, a scientific basis is provided for ecological restoration of the saline-alkali wetland, the operation is convenient, and the repeatability is high.

The invention discloses a coastal wet-water saline-alkaline area paddy-upland rotation soil water-salt-carbon-fertilizer coordinated regulation and control method, which comprises the following steps: (1) constructing an open trench + concealed conduit + monitoring network three-dimensional drainage salt control system to realize zoned active salt control; (2) adopting an intermittent tillage system based on soil texture, and optimizing a plough layer structure through combination of periodic deep tillage and conventional rotary tillage; (3) performing straw zoned returning, constructing a deep salt-resistant layer in the deep tillage year, and quickly increasing organic matters in a plough layer in the rotary tillage year; (4) applying biologically active and stable carbon sources in a compatible manner, and determining the carbon input amount according to the salinity level, so as to realize directional fertilization and carbon library compatibilization; and (5) implementing a nitrogen-increasing fertilization strategy adaptive to salt stress, and realizing efficient utilization of nitrogen in combination with urease and a nitrification inhibitor. Through cooperation of multiple links, the productivity and sustainability of the coastal saline-alkali land paddy-upland rotation system are systematically improved.

The present application relates to a kind of farmland root layer soil salt content inversion method and application based on remote sensing data fusion.Different from other remote sensing inversion method can only roughly estimate surface soil salt content, the present application is based on the influence mechanism of crop growth period root layer soil salt on transpiration and evapotranspiration, using the relationship between relative evapotranspiration rate and soil salt stress correction coefficient to establish root layer soil salt content remote sensing inversion model, based on remote sensing image data fusion with different temporal and spatial resolution, inversion obtains the spatial distribution rule of root layer soil salt on regional scale, and combines with the temporal and spatial evolution rule of remote sensing image data analysis for many years.The application of the present application technology can enrich soil water and salt transport theory, perfect remote sensing monitoring method, also can help to deeply understand the temporal and spatial evolution rule of regional scale farmland evapotranspiration rate and root layer soil salt and its driving mechanism, for optimizing planting structure and water and soil resource allocation, promote the sustainable development of saline-alkali agriculture and provide new means and scientific basis for protecting ecological environment.

Methods and systems for remote detection of growth conditions of a plant species. In a particular implementation, the present invention provides improved techniques for identifying one or more stress conditions in plants, including without limitation, drought stress, temperature stress, salinity stress and other conditions in a plant species. An example implementation assesses both steady-state chlorophyll fluorescence and green light reflectance of a plant species in real-time. A controller may detect drought and / or other stress conditions by comparing the respective signal trajectories of observed chlorophyll fluorescence and green light reflectance.